56 EN/39B/06.2018 © STULZ SpA – all rights reserved
SAL
DANGER
The ONOFF button on the C2020 display (if present) is only used to put the unit on stand-
by. It must therefore not be considered as a safety device for switching off the unit prior to
maintenance operations.
8. Maintenance
8.1. Safety instructions
Installation and intervention on air conditioners must be made in full compliance with specific
national regulations for accident prevention, with particular reference on electric and refrigerant
equipment. Failure to comply with these regulations might be dangerous to people and environment.
Before any intervention on the unit, refer to instructions on this manual, check data on the name-
plate and take any other precaution in order to guarantee optimal safety.
Safety procedures
DANGER
Cut off the power supply to the unit before making any maintenance operation. A “DO NOT
SWITCH ON” warning sign must be clearly visible. ONOFF key on C2020 display (if present) is
only used to put the unit is stand-by.
Live electric components have to be switched to de-energized and checked to ensure that they
are in the de-energized state.
Some verifications must be effected with the unit in operation (measuring current, pressures,
temperatures). In such a case, the unit must only be switched on at the master switch after all
mechanical connections have been carried out. The unit must be switched off immediately after
the measuring procedure.
The electric box might be hot.
Maintenance operations may only be performed by authorised and qualified technicians.
8.2. Preventive maintenance schedule
ATTENTION
Very little routine maintenance is necessary to keep the unit in reliable operating order and
protect its moving parts. This maintenance, however, must be performed at the prescribed
maintenance intervals. Failure to perform maintenance, in addition to affecting the unit durability
and operation, invalidates the warranty.
If air conditioner works in particularly dirty environment or if experience shows that a more
frequent maintenance is needed, this must be made as necessary.
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